* {
    margin: auto;
    padding: auto;
}

body {
    background-color: black;
    color: white;
}

a,
button {
    cursor: pointer;
}

a {
    color: white;
    text-decoration: none
}

a:visited {
    color: white;
}

.top {
    background-color: #444444;
    height: 100px;
}

.biaoti {
    float: left;
    font-size: 50px;
    margin: 10px;
    font-weight: 600;
}

.suoyin {
    float: left;
    padding: 20px 10px;
    margin: 20px 0;
}

.suoyin:hover {
    background-color: gray;
}

.middle {
    background-color: rgb(30, 30, 30);
    width: 980px;
    height: 600px;
    border-left: 1px solid rgb(30, 30, 30);
    border-right: 1px solid rgb(30, 30, 30);
    padding-top: 100px;
}

.denglu {
    width: 300px;
    height: 600px;
}

.biao1 {
    font-size: 40px;
    text-align: center;
}

.neirong {
    margin: 10px auto;
    font-size: 20px;
}

.denglu button {
    background-color: rgb(0, 217, 255);
    border: none;
    color: white;
    margin: 0 auto;
    display: block;
    width: 100px;
    height: 30px;
}

.bottom {
    height: 100px;
    width: 980px;
    background-color: black;
    border-left: 1px solid rgb(30, 30, 30);
    border-right: 1px solid rgb(30, 30, 30);
    text-align: center;
    padding-top: 10px;
}

.bottom a {
    background-color: grey;
    font-size: 30px;
    float: left;
}

.daohang {
    bottom: 100px;
    left: 1410px;
    position: fixed;
}

.daohang li {
    cursor: pointer;
    list-style-type: none;
    background-color: grey;
    padding: 10px;
}